Twyer



UNITED STATES i PATENT I OFFICE.

ALEXR. H. HART, OF CHAGRIN FALLS, OHIO.

TWYER.

Speccation of Letters Patent No. 5,479, dated March 21, 1848.

To all whom t may concern:

Be it known that I, ALEXANDER H. HART, of Chagrin Falls, in the countyof -Cuyahoga and State of Ohio, have invented a new and Improved Mode ofConstructing Twyer-v Irons for Blacksmiths Forges; and I do herebydeclare the following is a full and exact description.

The nature of my invention consists in constructing a twyer which formsa bed or lap for the burning coals, furnished with two orifices for t-heescape of the wind opposite to each other, which orifices are soconnected with a revolving valve by which the blast can be directed inwholeor in part through one or both of t-he orifices at the same time,or otherwise regulated to suit the convenience of the artisan.

To enable others skilled in the art to make and use my invention I willproceed to describe its construction and operation reference being hadto the annexed drawings making a part of his specification.

Figure 1 represents the twyers with all the parts in their proper placesand ready for use. Fig. 2 represents the lower section of the twyer.Fig. 3 represents the dividing plate or diaphragm. Fig. 4 represents theLipper half of the tube or nozzle of the twyer. Fig. 5 is a ring forbinding the two halves of the tube. Fig. 6 represents the under surfaceof the upper section of the twyer. Fig. 7 represents the circular valve.Fig. 8 is a section of the twyer in a vertical direction.

Letter A Figs. 1 and 8 represents the opening into which is to beinserted the nose of the bellows pipe; letter B is the chambercontaining the revolving circular valve, letter D Figs. 1 and 8 andletter E Figs. 1 and 8 are the orifices for the blast.

Letter F Fig. 1 is the bed orllap for containing the coals and letter CFig. 1 is the stem of the valve.

The twyer is made of metal, cast-iron is preferred and is composed ofthree principal sections Figs. 2, l and 6. Fig. 2 represents the main orbottom section, letter B the lower half of the valve chamber, letter Gthe channel through which the blast is conveyed to the orifice D Figs. 1and 8. This channel is separated from the one which conveys the blast tothe orifice E Figs. 1 and 8 by a diaphragm C Figs. 3 and 8 made of athin plate of metal the end marked a Fig. 3 coming in contact with thesurface of the cooling valve Fig. 7. The operation of these two partswill be further explained hereafter. Fig. 4 represents the upper portionof the pipe and valve chamber A B Figs. 1 and 8. This part Fig. 4;, istted to the lower half air-tight and secured by a band Fig. 5 whichembraces the ends of -both parts shown at A Fig. 1, the other end beingsecured to the under section by a clasp which embraces both partsimmediately forward of the valve chamber, the cap of this clasp issecured by nuts shown at a a, Fig. 1 and at a Fig. 8. Fig. 6 representsthe under side of the upper section of the bed or lap. This section isrepresented in its proper place in Fig. 1 letters Z) b; the under sideis grooved out thus forming a channel for the passage of the air to theorifice E Figs. 1 and 8, the groove is shown in sect-ion at G Fig. 8.This section is secured to the bottom'piece by the end or point a Fig. 6passing under a portion of the cap and secured by a key as shown at cFigs. 1 and 8. The outer ends are clasped together by a band passingaround a projection on both sections as shown at H Fig. 1 and at I Fig.8. The valve, Fig. 7 is a solid cylinder with the except-ion of amortise through the center which mortiseis wedge shaped as representedat a b c Fig. 7 and in section at F Fig. 8. The stem of this cylindervalve passes through the front side of the valve chamber as shown at ClFig.' 1 for the purpose of revolving the valve.

The operation of this twyer is a follows: If the blast is desired at theorifice D Figs.

1 and 8 the cylinder is turned so that the upper edge of the small endof the mortise is below the diaphragm C Figs. 3 and 8 the air is thusconveyed along the channel G Fig. 2 and H Fig. 8 to the aperture D Figs.1 and 8. If the blast is required at the orifice E, the cylinder valveis turned upward so that the lower edge of the small end of the mortiseis even with the upper side of the diaphragm. The air is thus conveyed`end of the mortise is divided by the diaphragrn. The blast is directedinto each of the channels and escapes into the fire at both orifices.regard to quantity or strength by partially closing the channels orturning the valve, or the blast may be entirely cut off by turning thecylinder so as to bring the mortise perpendicular should the sectionFig. 6 become injured by heat it can at a trifiing expense be replaced.By loosening the key at ,c Figs. l and 8 and the band at H Fig. 1 and IFig. 8 the injured part can be removed and a new one returned.

The blast can also be varied in A. H. HART.

Witnesses:

A. UPHAM, Jr., F. POOLE.

